Evaluation of potassium soil tests and methods for mapping soil fertility properties in Iowa corn and soybean fields

Barbagelata, Pedro A.

doi:10.31274/rtd-180813-15419

Cited by 9 publications

(6 citation statements)

References 66 publications

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“…In addition, the soil-testing method influences the threshold values. In our study, the threshold values for the NH 4 OAc and M3 extractants were the same, as also observed in Barbagelata's similar study of corn and soybean yields (Barbagelata, 2006). Several other authors have also reported similar findings relating to the effects of these extractants on soil K (Gartley et al, 2002;Wang et al, 2004).…”

Section: Evaluation Of Available Soil Ksupporting

confidence: 90%

Potassium‐fertilizer management in winter oilseed‐rape production in China

Ren

Lü

et al. 2013

Z. Pflanzenernähr. Bodenk.

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Optimal potassium (K) fertilization is beneficial for oilseed-rape (Brassica napus L.) yield and quality. However, the discrepancy between the high K demand of winter oilseed rape and low soil fertility and insufficient potassium input has limited the sustainable development of oilseedrape production. A series of on-farm experiments in the key winter oilseed-rape domains of China was conducted from 2004 to 2010 to evaluate K-fertilizer management for winter oilseed rape. Currently, the average NH 4 OAc-extractable K content in the 0-20 cm soil layer is 89.1 mg kg -1 indicative of "slight deficiency". In addition, farmers in China usually fail to use sufficient K fertilizer in oilseed-rape production, the average mineral-potassium-fertilizer input in 2010 being only 35 kg K ha -1 , far lower than the recommended rate of potassium for winter oilseed rape. Adequate potassium fertilization significantly raises seed yield. The average yieldincrease rate for the major production regions due to K-fertilizer application was 18.5%, and the average K fertilizer-use efficiency 36.1%. Based on the negative correlation between yield response to potassium fertilization and available soil K content, a soil-K-test index was established for winter oilseed rape with a threshold value for NH 4 OAc-extractable soil K of 135 mg kg -1 . When available soil K-content is below this threshold value, more K fertilizer should be applied to achieve high seed yield and to increase soil fertility. The major challenge for K-fertilizer management in winter oilseed-rape production in China will be to guide farmers in the different regions in making reasonable use of K fertilizer through soil K-testing technology in order to maintain both seed yield and soil fertility.

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Section: Evaluation Of Available Soil Ksupporting

confidence: 90%

Potassium‐fertilizer management in winter oilseed‐rape production in China

Ren

Lü

et al. 2013

Z. Pflanzenernähr. Bodenk.

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“…All these findings indicate that our study sites have a high potential to increase the productivity of maize by applying P fertilisers without affecting the environment, as the threshold value of Olsen-P is 40 ppm (Zhong et al, 2004, cited by Bai et al, 2013 that cause environmental pollution. The values of exchangeable K were far above the threshold values of soil exchangeable potassium for the growth of crops (Barbagelata, 2006;IPI, 2016), indicating that K application could not significantly improve maize production and productivity for the study sites. Adeoye and Agboola (1985) in Nigeria reported a critical level of exchangeable K that ranges from 0.6 to 0.8 cmol kg -1 of soil for maize, whereas Farina et al (1992) in South Africa reported 0.32 cmol L -1 for the production of maize-critical exchangeable K. The inherent potential of the soil is sufficient to supply the required quantities of K to produce maize in the study site for at least the present situation.…”

Section: Results Of Soil Analysis For the Study Sitesmentioning

confidence: 83%

“…, 2013) that cause environmental pollution. The values of exchangeable K were far above the threshold values of soil exchangeable potassium for the growth of crops (Barbagelata, 2006; IPI, 2016), indicating that K application could not significantly improve maize production and productivity for the study sites. Adeoye and Agboola (1985) in Nigeria reported a critical level of exchangeable K that ranges from 0.6 to 0.8 cmol kg -1 of soil for maize, whereas Farina et al.…”

Section: Discussionmentioning

confidence: 83%

Yield-limiting plant nutrients for maize production in northwest Ethiopia

et al. 2022

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Summary The potential yield of improved maize varieties usually cannot be fully realised mainly due to inappropriate soil nutrient management practices in most parts of Ethiopia. Site-specific fertiliser recommendations are rarely used in the farming systems of Ethiopia. There is also a lack of data to develop or validate decision support tools for targeting specific crop production. A study was conducted for three consecutive rainy seasons (2016–2018) in the maize belt of the north-western parts of the Amhara National Regional State of Ethiopia. The objectives were to obtain the maximum achievable yield potential of maize, determine the most yield-limiting nutrients and create a database of maize responses to applied nutrients so that decision support tools could be developed for the study areas. Treatments were individual nutrients (nitrogen (N), phosphorus (P) and potassium (K)) and combinations of the three. In some treatments, NPK was also combined with sulphur, zinc, lime and compost. Two hybrid maize varieties (BH-540 and BH-660) adaptable to the study areas were used. BH-540 was used for the Mecha district, while BH-660 was used for the south Achefer, Jabitahnan–Burrie–Womberma districts. Maize yield increased by more than 50% due to fertiliser applications compared to without fertiliser. The study showed that the possibility of increasing maize productivity to more than 12 t ha-1 for the study sites. The most yield-limiting nutrient in the study sites was N, followed by P; K was not a yield limiting. Without N the yield of both varieties was non-significant from the control (without added nutrients). Maize grain yield did not respond to application of lime, compost, zinc and sulphur. The result also showed very high variability across sites, indicating that it is important for policymakers, farmers and investors to consider site-specific fertiliser recommendations. Finally, a database containing intensive plant response to NPK for maize was generated and could be used as input in site-specific decision support tools development.

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“…The CEC of a soil partially depends upon the amount and type of clay minerals. CEC was observed to be positively related to the change of K levels in the soil samples when exposed to drying [28].…”

Section: Comparison Of Soil Potassium Test Based Upon Air-dried and Fmentioning

confidence: 91%

Evaluation of Soil Potassium Test to Improve Fertilizer Recommendations for Corn

Rakkar¹,

Franzen²,

Chatterjee³

2015

OJSS

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The soil potassium (K) test methodology is under increased evaluation due to the soil sample drying effect, temporal variations of test results and inconsistent crop response to applied K fertilizers. Ten on-farm trials were conducted in 2014 in eastern North Dakota to determine the corn response to different K-fertilizer rates and to assess the variation of soil K test levels between airdried (KDry) and field moist (KMoist) soil samples during the corn growing season. Significant differences were observed between KDry and KMoist soil K test results. The ratio of KDry/KMoist showed high correlation with cation exchange capacity (r = 0.63, p < 0.10), Organic matter (r = 0.61, p < 0.10) and (Ca + Mg)/K ratio (r = 0.64, p < 0.10) from the 1 M ammonium acetate extractant, while pH, electrical conductivity, clay (%), and soil moisture showed non-significant correlation. On average, KDry resulted in higher soil K test levels than KMoist and pattern of deviation was different for surface and sub-surface soil samples. Soil K analysis of samples collected during the fall and spring showed large enough variations to affect the soil test interpretation category which was used to make fertilizer recommendations. Corn yield increased significantly with applied K fertilizer at only three out of 8 sites with beginning K levels below the current critical level of 150 ppm, and one response was at a site with K level above the critical level. Therefore, use of either the KDry or KMoist method alone may not be adequate to predict K response in some North Dakota soils.

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Evaluation of potassium soil tests and methods for mapping soil fertility properties in Iowa corn and soybean fields

Cited by 9 publications

References 66 publications

Potassium‐fertilizer management in winter oilseed‐rape production in China

Potassium‐fertilizer management in winter oilseed‐rape production in China

Yield-limiting plant nutrients for maize production in northwest Ethiopia

Evaluation of Soil Potassium Test to Improve Fertilizer Recommendations for Corn

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